Overview
The AD8304ARU, produced by Analog Devices Inc., is a monolithic logarithmic detector optimized for the measurement of low-frequency signal power in fiber optic systems. It utilizes an advanced translinear technique to provide an exceptionally large dynamic range of 160 dB, from 100 pA to 10 mA, in a versatile and easily used form. The device is designed for high accuracy and temperature stability, making it suitable for a wide range of applications in fiber optic systems.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage (VP) | 3.0 V | 5 V | 5.5 V | V | |
| Input Current Range | 100 pA | 10 mA | A | ||
| Logarithmic Slope | 10 mV/dB | mV/dB | |||
| Output Bandwidth | 10 MHz | Hz | |||
| Slew Rate | 15 V/μs | V/μs | |||
| Quiescent Current | ~4.5 mA | mA | |||
| Operating Temperature | -40°C | +85°C | °C | ||
| Package Type | 14-Lead TSSOP |
Key Features
- Optimized for fiber optic photodiode interfacing with eight full decades of range.
- Single-supply operation (3.0 V to 5.5 V) with optional negative supply for enhanced flexibility.
- Accurate laser-trimmed scaling with a logarithmic slope of 10 mV/dB.
- Basic logarithmic intercept at 100 pA and easy adjustment of slope and intercept.
- Output bandwidth of 10 MHz and a slew rate of 15 V/μs.
- Low power consumption with a quiescent current of approximately 4.5 mA.
- 1-, 2-, or 3-pole low-pass filtering at the output.
- Miniature 14-lead TSSOP package.
Applications
- High-accuracy optical power measurement in fiber optic systems.
- Wide-range baseband log-compression.
- Versatile detector for Automatic Power Control (APC) loops.
- Alarm applications using the buffer as a comparator with or without hysteresis.
Q & A
- What is the dynamic range of the AD8304? The AD8304 has a dynamic range of 160 dB, from 100 pA to 10 mA.
- What is the typical supply voltage for the AD8304? The typical supply voltage is 5 V, but it can operate from 3.0 V to 5.5 V.
- What is the logarithmic slope of the AD8304? The logarithmic slope is 10 mV/dB.
- What is the output bandwidth of the AD8304? The output bandwidth is up to 10 MHz.
- What is the slew rate of the AD8304? The slew rate is 15 V/μs.
- What is the quiescent current of the AD8304? The quiescent current is approximately 4.5 mA.
- What is the operating temperature range of the AD8304? The operating temperature range is from -40°C to +85°C.
- What package type is the AD8304 available in? The AD8304 is available in a 14-lead TSSOP package.
- Can the AD8304 be used in battery-operated applications? Yes, the low quiescent current and chip disable features make it suitable for battery-operated applications.
- What are some common applications of the AD8304? Common applications include high-accuracy optical power measurement, wide-range baseband log-compression, and versatile detection for APC loops.
